Hi guys, it's like iCloud doesn't let u backup over 3G, you gotta be on wifi to backup yeah? Haven't had wifi in days because of my location and can't backup or access iCloud.
I'm not absolutely certain about this, because my iPad does not have 3G, but:
Your iPad will not automatically update over 3G. It won't even auto-backup over wi-fi unless it is plugged into a charger.
However, you can force backups, and that 'might' work over 3G.
Go into your iCloud settings and select Storage & Backups. You'll see a Back Up Now button. Before you select it tap the Manage Storage button and select your device from the Backups list. You'll see how much storage your current backup is taking, and how much the next backup will take. The difference is the minimum amount of data you'll be using on your 3G connection.
Other than that it is difficult to tell how much data backing up will use. It is smart, so it won't be the full size of the backup file; but depending on how many changes you've made since the last backup it could be a good sized portion of that file.
You'll want to keep these two things in mind, and your plan's data usage limits.
Anyway, with a little luck the Back Up Now button should work.
If it does not the only other thing I can suggest is to go to a free hotspot (when you finally get near one) and then force the backup. Unless your backup is huge it should finish by the time you've had a cup of coffee and snack.
Good luck.